聚苯乙烯/交联丙烯酸甲酯共混物的制备及其发泡性能研究

将聚苯乙烯（PS）颗粒溶解到二乙烯基苯（DVB）、丙烯酸甲酯（MA）与偶氮二异丁腈（AIBN）的混合物中，通过加热引发MA聚合，获得PS/交联PMA共混物, 采用釜压法制备了PS/交联PMA共混物泡沫。采用全自动视频光学接触角测试仪、差示扫描量热仪、傅里叶变换红外光谱仪、动态力学分析仪对PS/交联PMA共混物的结构和性能进行了表征，并通过扫描电子显微镜对PS/交联PMA共混物泡沫的结构进行了表征。结果表明，交联PMA的引入能提高体系的成核效率，随着MA用量的增加，PS/交联PMA共混物的接触角从PS的100.5 °降至86.1 °；当MA的用量为9.6份（质量份，下同）时，PS/交联PMA共混物的泡孔尺寸主要分布在40~60 μm之间，泡孔尺寸分布明显变窄，泡孔密度达到了1.2×10⁸ 个/cm³。

Study on Preparation and Foaming Properties of Polystyrene/Cross⁃linked PMA Blends

The blends of polystyrene (PS) and cross?linked poly(methyl acrylate) (PMA) were prepared by dissolving PS particles in a mixture of divinylbenzene, methyl acrylate (MA) and azobisisobutyronitrileand then initiating the polymerization of MA. The resulting blends were used to prepare a series of blend foams by an autoclave method. The structure and properties of PS/cross?linked PMA blends were characterized by a contact angle tester, differential scanning calorimeter analyzer, Fourier?transform infrared spectrometer and dynamic mechanics analyzer, and the structure of the blend foams was investigated by scanning electron microscopy. The result indicated that the introduction of cross?linked PMA improved the nucleation efficiency of the foaming system, and the contact angle of the blends decreased from 100.5 ° to 86.1 ° with an increase of MA content. The blend foams exhibited a narrow distribution in bubble size at the MA amount of 9.6 phr. Their cell size was distributed in the range of 40~60 μm, and their cell density reached 1.2×10⁸ every square centimeter.